Jack.



W. C. BRINTON.

JACK.

APPLlcAnoN man Aue.26. |915 Patented May 21,1918.

2 SHEES-SHEET 2.

v'WILILARID C. BRINTON, OF NEW YORK, N. Y.

i JACK.

Specication of Letters Patent Application iled August 26, 1916. SerialNo. 117,031. v

To all whom z't may concern Be it known that I, WILLARD C. BRINTON, acitizen of the United States of America, and a resident of New York,county and State of New York, have invented certain new and usefulImprovements in Jacks, of which the following is` a specification,reference being had to the accompanyingdrawings, forming a part thereof.

My invention relates to elevating or lifting jacks and has 'specialreference to jacks of the screw type.

In my copending application Serial No. 802,192, filed November 21, 1913,of which this application is a continuation in part, I have shown anddescribed a motor truck which is particularly adapted for handlingfreight on platforms and is equipped with elevating jacks at itscorners.

My present invention pertains to jacks which are specially adapted forthis purpose, although it willAof course be understood that my jack maybe used in various ways and I only intend that such .limitations beimposed as are indicated in the appended claims.

One object of my invention is to provide a jack that shall be relativelysimple and particularly durable and compact in construction and thatshall be fully protected from dirt and from injury, -and particularlyadapted for its intended purpose.

In order that my invention may be thoroughly understood I will nowproceed to describe thesame in the following speciica'- tion, and thenpoint out the novel features thereof in appended claims.

Referring to the drawings:

Figure 1 is a sectional elevatiomof a jack arranged and constructed in4accordance with, and constituting an embodiment of, my invention. y

Figs. 2 to 5 inclusive are sectional plan views taken respectively onthe lines 2 2, 3 3, 4 4 and 5 5 of Fig. 1. y

Fig. 6 is a view corresponding to Fig. 1, of a slightly differentstructure which embodies my invention.

ySpecial reference may lirst be had to Figs. 1 to 5 inclusive in which10 designates the platform frame of'a truck or vehicle and 11 thehousing which is secured to 'the frame by -any suitable means such asbolts 12, and forms a part of the jack. The housing has the form of asleeve with a constricted lower end to provide a guide bearing 13 and anenlargement near its upper end to provide a guide bearing 14. It has ayoke for- Patented May 21, 1918. y

mation at the top to support/a guide bush- In addition to the housingthe jack comprises a spindle or jack screw 16, an actuat-` ing thilnble17, and a lifting or elevating quill 18 which is arranged to slide upand down within the thimble 17, but is prevented from turning by keys19.

-Adjacent to the guide bearing 13 is a frictionless thrust bearing 20,and I prefer to utilize bearing rollers 21 for the guide bearin`14. t hespindle 16 has a screw-threaded upper -section 22, ,a recess 23 at thetop, a square or polygonal enlargement 24 below the threaded section,and a cylindrical section- 25 at the bottomwhich extends through thethrust bearing -20 and the guide bearing 13. The extreme lower end isscrew-threaded as indicated at 26, to receive a nut 27v which holds aflange or collar 28 in place.

One of the thrust collars 29 of the fric.- tionl'ess bearing 20 is inengagement with the square enlargement 24 to support the downward thrustupon the spindle and the collar 28 overhangs .the lower end of thehousing 11 and prevents the spindle from being displaced upwardly.

The housing is closed by screwed onto its lower end. Y

The thimble 17 is rotatably mounted in the roller guide bearing 14 andhas a square opening 31 which fits the square enlarged section 24 ofthe-spindle. Atthe top of the thimble are a plurality ofoutwardlyextending lugs 32 to which a sprocket wheel 33 is secured by bolts 34 orother suitable means.

The sprocket wheel has an annular projection 35 which' overhangs theupper end ofthe body of the housing to 'prevent extraneous matter fromgetting into the guide bearing 14 and into the thimble (see Fig. 1).

vThe arrangement of parts is such that when the sprocket wheel 33 isdriven the motion is transmitted through the thimble to' actuate thespindle. The spindle itself, when actuated, does not advance, being heldin xed vertical position by the thrust bearings as already explained,but the turning of the screw-threaded section of the spindle 22 causesthe quill 18 to be elevated as I will now explain.

'Ihe quill has a flange 36 at its lower' end a cap 30 which is which itsfreely into the body of the thimble 17 and extends almost to the squareenlargement 24 ofI the spindle in its bottom position. It has aninternally threaded constricted section 37 which eoperates with. thescrewthreaded section 22 of the spindle, and it is preferably formed ofBabbitt or some suitable bearing metal which is cast into the lower endof the quill 18.

The vquill has longitudinal slots or keyways 38 to coperate with thekeys 19-so that it is vprevented from-rotating -with the spindle. A plug39 is screwed into the mouth of the quill as shown in Fig. 1.

A plug 40 is set into the recess 23 and in the ends of vthe spindle andforms a raceway for a plurality of bearing balls 41 upon which arotatable stop lug 42 is mounted. The upper end of this stop engages theplug 39 of the quill 18 when the quill is at the bottom of its movement.

As already explained, the housing has the form of a yoke at the top andthe upper'extension of this yoke provides a ring 43 from which aplurality of spaced lugs 44 extend inwardly as shown in Fig. 2.

lThe bushing 15 has 'a top flange 45 whic is perforated to receive bolts46 and overhangs the lugs 44 of the housing to which it is secured bythe bolts.

The bushing has an overhanging fiange 47 which interlocks with anupwardly extending annular projection 48 of the sprocket wheel 33, theouter surfaceof the bushing being formed to t freely into the sprocketwheel and into the upper end of the thimble 17.

The bushing has a cylindrical bore of suitable size to receive, andconstitute a Aguide bearing for, the quill 18.

The bushing is provided with key slots 49 which extend downwardly to 1anintermediate point in the length of the bushing where they terminate inthrough-holes 50. These holes facilitate the cutting of the keyway byproviding an outlet for the tool in a well known manner and alsoconstitute sockets which receive laterally extending lugs 51 which areriveted or otherwise secured to the keys 19 at their lower ends. Thebushing 15 is provided near the top with an kannular groove 76. withwhich one or more Islots or discharge openings 77 communicate. Oil anddirt are collected in the groove and are discharged through the slots 77into the drip pan or receptacle formed by a ange 52 in the housing.

r1`he aforesaid coperating partsfacilitate the assembling of the devicewhich will now be explained. The spindle and thimble are rst securedtogether and are then mounted in the housing. The sprocket wheel 33 isnot attached to the thimble and the thimble lugs 32 are turned so as toavoid interfering with the housing lugs 44 until the thimble is in its1proper longitudinal position relative to the ousing. It is then turnedto a. slight angle to bring the bolt -holes in the lugs 32 int'oregister withl the bolt holes in the lugs 44. Thesprocket wheel 33 isnext introduced laterally between the yoke connected sections of thehousing and is lit-ted onto the thimble. The bolts 34 have slotted headsand are driven into place by a screw driver which extends through thebolt hole in the housing lugs 44. The quill 18 is next screwed onto thespindle, then the plugs 4 0 and 42, together with the'bearing balls 41,are setl into the recess 23 of the spindle.

The keys 1,9v are next set into the keyways 49 of the bushing l5 withthe lugs o1 extending into the sockets 50; then the bushing is mountedin position, the keys`19 engaging the keyways 38 of the quill. Thebushing is held in place by the bolts 4G which engage the housing lugs44 as already explained. Finally, the plug 39 is screwed into the top ofthe quill 18.

Before describing the structure shown in Fig. 6, I will discuss theoperation of that already described. Assuming that the parts occupy thepositions as shown in the drawings, if the sprocket wheel 33 is drivenin one direction by a sprocket chain `or other suitable actuating means,the thimble 17 to which it is attached, is correspondingl rotated. inthe rollerl bearings 14. The splndle 16, which, as already explained,bears a fixed relation to the thimble, is also rotated with the resultthat the quill together with the plug 39, is elevated. The spindleitself is held in a fixed llongitudinal position b `the thrust collars20 and 29 and the quil is prevented from turning by the keys 19 asalready explained, so that the longitudinal movement of the quillresults.

If the actuation of the sprocket wheel 33 continues, the quill 18 iselevated until the flange or enlargement 3601 the quill comes intoengagement with the lower end of the bushin 15.

If t e direction of rotation for the sprocket wheel is now reversed thespindle turnsl in the opposite direction and the'quill 18 is lowered.The downward movement of the quill is limited by the engagement of 'thetop of the plug 42 with the inner surface of the plug 39.

The frictionless bearings 41 prevent the locking of the quill in itsbottom position, due to the setting of the `quill plug against the endof the spindle. This is evidently accom lished by the arrangement shownsince t e spindle plug may remain stationary when the spindle is firstturned.

Attention is particularly directed to the v Any, oil or grease which maywork out of the bearings and housing will be collected in the drip panor receptacle formed by the flange 52. The cap 30 seals the housing atthe bottom and hence the structure is particularly well adapted toextend downwardly from the frame ofa motor vehicle.

It will also be observed that when the quill is lowered its top surfaceis flush with the floor of the vehicle body. The struc-ture shown inFig. 6 is similar in general to that of the previous figures andcomprises a flanged ring 57 which reinforces the opening in the lioorplate and is slotted to receive the keys 55. It constitutes a bearingfor the upper end of a quill 54, the lower end of which is enlarged tofit the hollow cylindrical opening in the thimble 53. The arrangement issuch that an annular shoulder 58 is provided to limit the outwardmovement of the quill 54 by engaging the flanged reinforcing ring 57.The quill 54 is provided with a central opening which is constrictednear its lower end and is tapped to engage the threaded portion of thespindle G2. The upper part of the hoisting member is hollow to form agrease-cup 59 and is closed by a plug 60.

The spindle 62 has a collar 63 which rests on a shoulder 6i of thethimble The lower part of the spindle which is below the collar, ispreferably pressed into a suitable hole in the bottom of the thimble andis firmly secured to the thimble by a `key 65 or other suitable means.An annular thrust bearing 66 is mounted within the cup-shaped bracket G7at the bottom, and supports the thimble 53 and the spindle which issecured to it. l

The thimble at its upper end, is fitted onto the lower part of theflanged ring 57 which constitutes a guide bearing. Opposite thisbearing, near the' upper end of the thimble, is a sprocket wheel 68which is engaged by a hoisting chain 69.

Rotatably mounted on the thimble adjacent to the sprocket wheel is aSheave 70 which constitutes a guide for the steering cable 71.

The lower end of the spindle is guided by a bearing 72 in the bracket67, the bearings (3(5 and 72 being supplied with lubrication throughgrease passages 73 which communicate at the lower end of the spindlewith a compression grease cup 74.

Other modifications may be effected within the spirit and scope of myinvention, and I intend that only such limitations be imposed as areindicated in appended claims.

`What 1 claim is:

1. A hoisting jack adapted to be mounted Hush with a floor or deck,comprising a stationary housing atlixed at the fioor or deck, a thimblerotatably mounted therein with a bearing near the top, a spindleextending through sad housing and said thimble and secured to saidthimble near the bottom, and a hoisting quill mounted to slide withinsaid thimble and adapted to be raisedvand lowered by the rotation ofsaid spindle.

2. A hoisting jack adapted to be mounted iush with a floor ordecl{,comp1ising a stationary housing affixed at the Hoor or deck, athimble rotatably mounted therein with a bearing near the top, a spindleeX- tending through said housing and said thimble and secured to saidthimble near the bottom, a hoisting quill mounted to slide within saidthimble and adapted to be raised and lowered by the rotation of saidspindle, and rotatable means for stopping the -descent of hoisting quillwhen its top is fiush with the floor or deck.

3. Ahoisting jack adapted to be rmounted flush with a floor or deck,comprising a relatively stationary cup-shaped supporting housing aiixed.at the floor, a thrust bearing near the bottom of the housing, a thimblerotatably mounted on said thrust bearing within said cup-shaped housingand adapted to have power applied to it at the top, a screwthreadedspindle extending through said housing and said thimble and secured tosaid thimble, a hollow cylindrical hoisting quill flush with the Hoorwhen retracted and mounted to slide within .said thimble and screwedonto said spindle, and `means for preventing the rotation of thehoisting quill whereby the said quill is elevated by the rotation of thethimble and the spindle.

4. A' hoisting jack adapted to be mounted flush with a floor or deck,comprising a relatively stationary cup-shaped supporting housing aiixedat the floor and having a vertical guide bearing at its lower end and anannular frictionless thrust bearing near its lower end above the guidebearing, a thimble rotatably mounted on said thrust bearing within saidhousing, a screw-threaded spindle extending vertically through saidthimble and secured thereto and supported at its lower end in saidguide'bearing, a hoisting member mounted to slide vertically withinsaid'thimble and screwed onto said spindle above the point of connectionthereof with the thimble, a relatively stationary guide bushing at thetop of the thimble,

keys set in said bushing for preventing the rotation of the hoistingmember, and a sprocket wheel secured near the upper edge of the thimblewhereby the rotation of the sprocket wheel and the consequent turning ofthe thimble and a spindle serves to elevate the hoisting member, the topof said member being flush with the floor in its retracted position.

5. A hoisting jack for a truck platform comprising a supporting housingdepending from the platform frame, a screw-threaded spindle rotatablymounted therein and held against lon itudinal movement thereby, a

screw-threa ed hoisting member coperatf with the floor or deck, aspindle extending into the housing and arranged to be rotated therein, ahoisting member mounted to slide vertically in the bushing and adaptedto extend downwardly into the housing withits top Hush with the floor ordeck in its retracted position, and means adapted to have power appliedto it at a point near the floor for turningA the spindle.

7. A hoisting jack adapted to be mounti ed flush with a floor or deck,comprising a relatively stationary cup-shaped housing se# cured to theiooror deck near its` upper end and extending downwardly therefrom, ascrew-threaded spindle rotatively mounted within the housing andsupported near the lower end thereof and a hoisting member threaded nearits lower end t0 coperate with the spindle and extending into thehousing with its upper end flush with the Hoor in its retractedposition, means for preventing the rotation of the. hoisting member, andmeans for turning the spindle,

8. A jack for a truck platform comprising a housing having a cup-shapedbody and a spaced integral ring at the top, a screw-threaded spindlerotatively mounted within the housing, a thrust be-aring for preventinglongitudinal movement of the Spindle relative t0 the housing, a thimbleaffixed to'the spindle near its lower end and extending slightly abovethe cupshaped body of the thimble, a sprocket wheel secured to thethimble at the top, a

hollow cylindrical quill surrounding the spindle and having aninternally' threaded portion coperating with the spindle, a stavtionarythreaded portion coperating with the spindle, a stationary bushingsecured to the ring member of the housing and extending between thethimble and the quill, keys ymounted in the bushing for holding thequill against rotation and a cap for closing the upper end of the quillover the top of the spindle, whereby the quill may be raised and loweredby actuating the sprocket wheel.

In witness whereof, I have hereunto set my hand this 24th day of August,1916.

WILLARD o. BRINTON.

